S–N plots and related phenomena of ultrafine grained copper with different stages of microstructural evolution

Goto, Masahiro; Han, Seung Zeon; Kitamura, Junichi; Yakushiji, Terutoshi; Ahn, Jin Ho; Kim, S.S.; Baba, M.; Yamamoto, Takaei; Lee, J.

doi:10.1016/j.ijfatigue.2014.11.014

Cited by 17 publications

(11 citation statements)

References 33 publications

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“…Fatigue properties enhancement S-N curves for both as-annealed and 4-pass ECARed pure coppers are shown in Figure 3. In this gure, the data are compared with the earlier studies of Goto et al [7] and Xu et al [8] on ultra-ne grained Cu. The number of cycles to the fracture increased with a decrease in stress amplitude.…”

Section: Microhardness and Tensile Test Resultsmentioning

confidence: 98%

“…The dislocation interaction with the other dislocations and grain boundaries play an important role in the fatigue resistance of pure UFG copper [5]. The absorption of defects and mobile dislocations inside the grains determines the fatigue life of ECARed copper [7]. The previous research studies have presented that the fatigue test of UFG copper at high stress amplitudes leads to cyclic softening and grain coarsening.…”

Section: Microhardness and Tensile Test Resultsmentioning

confidence: 99%

“…Several studies have explored the grainsize e ects on cyclic deformation of Ultra-Fine Grain (UFG) materials produced by ECAP. Most of them have shown an enhanced fatigue life of the UFG copper than the coarse-grained counterpart when the cycling is stress-controlled [7][8][9], while grain re nement under plastic strain-controlled testing is not advantageous to both high [10,11] and low purity coppers [8] due to cyclic softening under strain-controlled fatigue. Also, it is shown that a decrease in the purity of copper can improve the fatigue strength at S-N curve [12].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue behavior of nano-grained pure copper processed by equal channel angular rolling

Habibi¹,

Ketabchi²,

Eskandarzadeh³

2017

Scientia Iranica

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Abstract. The equal channel angular rolling process was successfully performed on commercial pure copper. After 4 passes of this process, grains with a diameter of about 70-500 nm were formed. The fatigue test results showed that the ultra-ne grained copper represents a longer lifetime under stress-controlled fatigue. To clarify the formation process of surface damage, morphological changes in the fractured surface were monitored by scanning electron microscopy.

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Section: Microhardness and Tensile Test Resultsmentioning

confidence: 98%

Section: Microhardness and Tensile Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue behavior of nano-grained pure copper processed by equal channel angular rolling

Habibi¹,

Ketabchi²,

Eskandarzadeh³

2017

Scientia Iranica

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“…With the development of the accumulative roll bonding (ARB), which is one of the most prominent severe plastic deformation (SPD) processes, a more cost‐effective method has been realized for the fabrication of LMCs beyond the laboratory scale . Moreover, such SPD processes typically result in materials with ultrafine‐grained (UFG) microstructures, which exhibit clearly enhanced monotonic as well as cyclic mechanical properties compared to their coarse grained (CG) starting material. However, very limited data is available in literature on the cyclic mechanical properties of UFG laminated metal composites.…”

Section: Introductionmentioning

confidence: 99%

High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

et al. 2018

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The focus of this paper is the designing of ultrafine-grained aluminum/steel laminated metal composites for innovative lightweight materials concepts used for cyclic loading. These ultrafine-grained composites are produced by the accumulative roll bonding process. Three different aluminum/steel composites are studied, where the position of the steel layers is varied, to investigate the influence of the layer architecture. The mechanical properties are measured in monotonic and cyclic three-point bending tests. The influence of the meso-and microstructure are intensively studied by scanning electron microscope observations. Furthermore, the internal stresses during elastic straining are calculated by a finite element simulation. In the composites, both monotonic and cyclic mechanical properties are strongly increased and are clearly higher as expected by a linear rule of mixtures of the constituent materials. This increase is particularly high for the fatigue properties resulting in a strongly enhanced specific fatigue limit of the composites.

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“…When the ECAP process is carried out by increasing the processing temperature it is possible to obtain an improvement in the fatigue life in the ultrafine grained materials [18]. In this way, Goto et al [19] analysed the influence of the number of ECAP passages in the fatigue behaviour of a copper alloy after 4, 8, and 12 passages. Gröber et al [20] analysed the fatigue behaviour of bolts both with ultrafine grain size after ECAP and without ultrafine grain size.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fatigue and Wear Behaviour in Ultrafine Grained Connecting Rods

Luri

Luis

León

et al. 2017

Metals

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Abstract:Over the last few years there has been an increasing interest in the study and development of processes that make it possible to obtain ultra-fine grained materials. Although there exists a large number of published works related to the improvement of the mechanical properties in these materials, there are only a few studies that analyse their in-service behaviour (fatigue and wear). In order to bridge the gap, in this present work, the fatigue and wear results obtained for connecting rods manufactured by using two different aluminium alloys (AA5754 and AA5083) previously deformed by severe plastic deformation (SPD), using Equal Channel Angular Pressing (ECAP), in order to obtain the ultrafine grain size in the processed materials are shown. For both aluminium alloys, two initial states were studied: annealed and ECAPed. The connecting rods were manufactured from the previously processed materials by using isothermal forging. Fatigue and wear experiments were carried out in order to characterize the in-service behaviour of the components. A comparative study of the results was made for both initial states of the materials. Furthermore, Finite Element Modelling (FEM) simulations were used in order to compare experimental results with those obtained from simulations. In addition, dimensional wear coefficients were found for each of the aluminium alloys and initial deformation states. This research work aims to progress the knowledge of the behaviour of components manufactured from ultrafine grain materials.

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S–N plots and related phenomena of ultrafine grained copper with different stages of microstructural evolution

Cited by 17 publications

References 33 publications

Fatigue behavior of nano-grained pure copper processed by equal channel angular rolling

Fatigue behavior of nano-grained pure copper processed by equal channel angular rolling

High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

Analysis of Fatigue and Wear Behaviour in Ultrafine Grained Connecting Rods

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